Sketch: make sure that Attachment editor shows up in the context-menu

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -2634,6 +2634,8 @@ void ViewProviderSketch::attach(App::DocumentObject *pcFeat)
 void ViewProviderSketch::setupContextMenu(QMenu *menu, QObject *receiver, const char *member)
 {
     menu->addAction(tr("Edit sketch"), receiver, member);
+    // Call the extensions
+    Gui::ViewProvider::setupContextMenu(menu, receiver, member);
 }
 
 bool ViewProviderSketch::setEdit(int ModNum)

src/Mod/Sketcher/Gui/ViewProviderSketch.h

@@ -136,8 +136,8 @@ using GeoListFacade = Sketcher::GeoListFacade;
  *
  */
 class SketcherGuiExport ViewProviderSketch : public PartGui::ViewProvider2DObjectGrid
-                                            , public PartGui::ViewProviderAttachExtension
-                                            , public Gui::SelectionObserver
+                                           , public PartGui::ViewProviderAttachExtension
+                                           , public Gui::SelectionObserver
 {
     Q_DECLARE_TR_FUNCTIONS(SketcherGui::ViewProviderSketch)